CN113683918B

CN113683918B - Carbon-free black ink based on point-reading printing and preparation method thereof

Info

Publication number: CN113683918B
Application number: CN202110967763.3A
Authority: CN
Inventors: 陈超; 尹巧
Original assignee: Hangzhou Toka Ink Co ltd
Current assignee: Hangzhou Toka Ink Co ltd
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2022-08-02
Anticipated expiration: 2041-08-23
Also published as: CN113683918A

Abstract

The invention relates to the field of offset lithographic printing ink, and particularly discloses carbon-free black ink based on point-reading printing and a preparation method thereof, wherein the carbon-free black ink mainly comprises the following components: rosin modified phenolic resin, alkyd resin, vegetable oil, mineral oil, mixed pigment and hyperdispersant. The preparation method mainly comprises the following steps: sequentially adding metered vegetable oil and mineral oil into a stainless steel reaction kettle, stirring, heating to 100 ℃, adding rosin modified phenolic resin and alkyd resin, continuously heating to 200 ℃, keeping the temperature for 30 minutes after the resin is completely dissolved, cooling to 80 ℃, adding a hyper-dispersant and mixed pigment mixed in proportion in advance, uniformly conveying to a bead mill by a pipeline, and grinding to obtain the finished product ink. The black ink has good color expression, can meet the color standard of ISO2846-1, and has the light resistance of more than 5 grades.

Description

Carbon-free black ink based on point-reading printing and preparation method thereof

Technical Field

The invention relates to the field of offset lithography printing and offset lithography printing ink, in particular to carbon-free black ink based on point-reading printing and a preparation method thereof.

Background

In recent years, reading books and textbooks have been widely used in the fields of children reading, primary and secondary school teaching and the like.

The essence of the method is that a reading pen capable of identifying OID (optical identity digital) codes is matched with a printed product printed with the OID codes to change a silent book into an audio reading material. The OID code is a two-dimensional optical identification code, also called invisible code, and has small actual size and can not be identified by naked eyes. The point-reading pen is an optical identification device of OID codes, and its main function is to identify the two-dimensional invisible codes on the printed matter by means of sensing head, and transfer the code value to audio decoder based on MP3 technology by means of communication interface through image decoding circuit, and before that, the correspondent speech file stored in the storage device can be sent out by means of pronunciation equipment so as to implement point-reading function.

The printing of ordinary prints usually uses four primary color offset inks of black, blue, red and yellow to exhibit various colors by color stacking. In the process of printing the point-reading printed matter, the point-reading pen is used for identifying according to the carbon black contained in the OID code, so the printing of the OID code needs to be carried out by adopting black offset printing ink containing a carbon black component. The ink used for the remaining black part of the printed matter must not contain carbon black, which would interfere with the recognition of the point-and-read pen, so that the three-color offset printing of blue, red and yellow is usually used according to a ratio of 1: 1: 1 to prepare gray ink. The color values L, a and b of the ink can not meet the color standard of ISO2846-1, and the tolerance value delta E is more than or equal to 3.0. The prints printed in this way therefore have a clear difference in colour appearance from conventional prints. In addition, black inks containing carbon black have a light fastness rating of 8 highest, while gray inks formulated with conventional offset inks of the three colors blue, red and yellow have a light fastness rating of 2, which results in fading of the printed matter after a period of use.

Disclosure of Invention

Aiming at the problems of insufficient color saturation, insufficient gradation, fading and the like of the existing point-reading printed matter, the invention provides the carbon-free black ink based on point-reading printing and the preparation method thereof, the carbon-free black ink has the same blackness and performance as the common offset black ink (containing carbon black), and accords with the color standard of ISO2846-1, and the light resistance grade is more than 5 grade.

The object of the present invention is achieved by the following technical means. A carbon-free black ink based on point-reading printing comprises the following components in parts by weight: 15-20 parts of rosin modified phenolic resin, 3-5 parts of alkyd resin, 23-28 parts of vegetable oil, 12-18 parts of mineral oil, 32-38 parts of mixed pigment and 1 part of hyperdispersant.

The mixed pigment comprises the following components in percentage by weight: 25-40% of PR170 pigment red, 25-40% of PY180 pigment yellow, and PB 15: 25-40% of 3 phthalocyanine blue and 1-5% of PG7 phthalocyanine green.

The vegetable oil is one or more of soybean oil, linseed oil, tung oil, rapeseed oil, rice bran oil and dehydrated castor oil.

The mineral oil is a high-boiling point petroleum solvent with the distillation range of 280-320 ℃ and the aromatic hydrocarbon content of less than or equal to 1%.

The hyperdispersant is Luborun P800.

The invention also provides a preparation method of the carbon-free black ink based on point-reading printing, which comprises the steps of sequentially adding metered vegetable oil and mineral oil into a stainless steel reaction kettle, starting stirring, adding rosin modified phenolic resin and alkyd resin after heating to 100 ℃, continuously heating to 200 ℃, keeping the temperature for 30 minutes after the resin is completely dissolved, then cooling to 80 ℃, adding the hyperdispersant and the mixed pigment mixed in proportion in advance, stirring at a high speed for 30 minutes, conveying to a bead mill by a pipeline for grinding, and obtaining the finished product of the ink for printing after the fineness of pigment particles is less than 7.5 micrometers.

The invention has the beneficial effects that:

1. the formula of the invention does not contain carbon black, is used for printing point-reading printed matters, replaces the traditional four-primary-color black ink in printing, and can be used for printing image-text parts except OID codes.

2. The color value of the carbon-free black ink is close to that of common offset black ink (with carbon black), and the carbon-free black ink meets the requirement of ISO2846-1 on the color value of the black ink: l is less than or equal to 18.0, a is 0.8 plus or minus 1.5, and b is 0 plus or minus 3.0.

3. Compared with the ISO standard, the tolerance value delta E of the carbon-free black ink is less than or equal to 3.0, and the carbon-free black ink can endow a read-on-demand printed matter with better color saturation and more vivid hierarchical expression.

4. The carbon-free black ink disclosed by the invention is evaluated by referring to GB/T22771-.

Detailed Description

The invention is further illustrated by the following examples: the difference between the various embodiments is that the mixture ratio of the mixed pigment is different, and the other component ratios and the production process are basically consistent. The parts are parts by mass unless otherwise specified.

Example 1: will: PR170 pigment red 36.5%, PY180 pigment yellow 29.6%, PB 15: 3, 31.9 percent of phthalocyanine blue and 2 percent of PG7 phthalocyanine green are uniformly mixed to prepare the mixed pigment 1.

Example 2: will: PR170 pigment red 38%, PY180 pigment yellow 28.6%, PB 15: 3, 31.4% of phthalocyanine blue and 2% of PG7 phthalocyanine green are uniformly mixed to prepare the mixed pigment 2.

Example 3: will: PR170 pigment red 38%, PY180 pigment yellow 28.6%, PB 15: 30.4% of 3-phthalocyanine blue and 3% of PG 7-phthalocyanine green are uniformly mixed to prepare the mixed pigment 3.

The subsequent preparation of the above three examples is as follows: respectively adding 25 parts of metered vegetable oil and 15 parts of metered mineral oil into three stainless steel reaction kettles, starting stirring, heating to 100 ℃, adding 18 parts of rosin modified phenolic resin and 4 parts of alkyd resin, continuing heating to 200 ℃, keeping the temperature for 30 minutes after the resin is completely dissolved, then cooling to 80 ℃, adding 3 parts of hyperdispersant, then respectively adding 1 part of mixed pigment, 2 part of mixed pigment and 3 parts of mixed pigment, stirring at a high speed for 30 minutes, conveying to a bead mill by a pipeline for grinding, and respectively obtaining finished ink examples 1, 2 and 3 after the fineness of pigment particles is less than 7.5 micrometers.

Comparative example 1: the red, blue and yellow common offset printing ink is prepared according to the following steps of 1: 1: mixing at a ratio of 1.

Finished ink Performance testing example 1, example 2, example 3 and comparative example 1 were color developed on a color Bonder printability tester using a two part roller at an ink level of 0.175 cc.

The color values L, a and b and the tolerance value delta E of the developed color sample are tested by an Alice spectrophotometer and are in accordance with the standard ISO 2846-1.

And testing the light resistance level of the color sample by using an ATLAS Ci3000+ light resistance tester. The light resistance of the ink is classified into 1-8 grades, wherein the 1 grade is the lowest, and the 8 grade is the highest.

The test results were as follows:

by combining the reference example 1 and the ISO2846-1 standard, the reference example 1 prepared by mixing the red, yellow and blue common offset printing inks does not meet the requirements of the ISO standard in the color values of L, a and b, the tolerance value delta E is more than 3.0, and the light resistance grade of the ink is only 2 grade.

By combining example 1, example 2, example 3 and ISO2846-1 standard, it can be seen that finished inks of examples 1, 2 and 3 all meet the requirements of ISO standard, the tolerance value Delta E is less than 3.0, and the light resistance grade of the ink is grade 5.

The mixing ratios of the mixed pigments of example 1, example 2 and example 3 are slightly different, so that the color values L, a, b and the tolerance value delta E are changed to some extent, but the ranges of the mixed pigments are not beyond the range required by the ISO2846-1 standard.

Example 4 differs from examples 1 to 3 in that: the carbon-free black ink comprises the following components in parts by weight: 15 parts of rosin modified phenolic resin, 3 parts of alkyd resin, 23 parts of vegetable oil, 12 parts of mineral oil, 32 parts of mixed pigment and 1 part of hyperdispersant.

Example 5 differs from examples 1 to 3 in that: the carbon-free black ink comprises the following components in parts by weight: 20 parts of rosin modified phenolic resin, 5 parts of alkyd resin, 28 parts of vegetable oil, 18 parts of mineral oil, 38 parts of mixed pigment and 1 part of hyperdispersant.

It should be noted that the carbon-free black inks used in examples 4 and 5 are slightly different from those used in examples 1 to 3, and the formulations in examples 1 to 3 are the most suitable, but examples 4 and 5 also have the better effects.

The above embodiments are merely preferred embodiments of the present invention, which should not be construed as limiting the scope of the invention, and therefore all equivalent variations that fall within the scope of the invention are intended to be embraced by the claims.

Claims

1. A carbon-free black ink based on point-reading printing is characterized in that: the composition comprises the following components in parts by weight: 15-20 parts of rosin modified phenolic resin, 3-5 parts of alkyd resin, 23-28 parts of vegetable oil, 12-18 parts of mineral oil, 32-38 parts of mixed pigment and 1 part of hyperdispersant; the mixed pigment comprises the following components in percentage by weight: 25-40% of PR170 pigment red, 25-40% of PY180 pigment yellow, and PB 15: 25-40% of 3 phthalocyanine blue and 1-5% of PG7 phthalocyanine green.

2. The carbon-free black ink based on point-and-read printing according to claim 1, wherein: the vegetable oil is one or more of soybean oil, linseed oil, tung oil, rapeseed oil, rice bran oil and dehydrated castor oil.

3. The carbon-free black ink based on point-and-read printing according to claim 1, wherein: the mineral oil is a high-boiling point petroleum solvent with the distillation range of 280-320 ℃ and the aromatic hydrocarbon content of less than or equal to 1%.

4. The carbon-free black ink based on point-and-read printing according to claim 1, wherein: the hyperdispersant is Luborun P800.

5. A method for preparing the carbon-free black ink based on point-and-read printing according to claim 1, wherein: sequentially adding metered vegetable oil and mineral oil into a stainless steel reaction kettle, starting stirring, heating to 100 ℃, adding rosin modified phenolic resin and alkyd resin, continuously heating to 200 ℃, keeping the temperature for 30 minutes after the resin is completely dissolved, then cooling to 80 ℃, adding a hyperdispersant and mixed pigment which is mixed in advance according to a proportion, stirring at a high speed for 30 minutes, conveying to a bead mill by a pipeline for grinding, and obtaining the finished product of the printing ink after the fineness of pigment particles is less than 7.5 micrometers.